<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <script src="../js/vue.js"></script>
    <script>
        Vue.createApp({
            template: `
                <h2>{{count}}</h2>
                <button @click="add">+1</button>
                <button @click="reduce">-1</button>
            `,
            data() {
                return {
                    count: 99
                }
            },
            methods: {
                add() {
                    this.count++
                },
                reduce() {
                    this.count--
                }
            },
        }).mount("#app")
    </script>
</body>
</html>